Smestad Jennifer O - 10 Feb 2026 Form 4 Insider Report for Otter Tail Corp (OTTR)

Role: VP, General Council & Corp Sec
Signature: /s/ Jennifer O. Smestad by James A. Versteeg, Attorney-in-Fact
Issuer symbol: OTTR
Transactions as of: 10 Feb 2026
Net transactions value: +$256,611
Form type: 4
Filing time: 12 Feb 2026, 09:26:23 UTC
Previous filing: 09 Feb 2026
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Smestad Jennifer O.	VP, General Council & Corp Sec	215 SOUTH CASCADE STREET, FERGUS FALLS	/s/ Jennifer O. Smestad by James A. Versteeg, Attorney-in-Fact	12 Feb 2026	0001726153

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	OTTR	Common Stock	Award	$518,580	+6,000	+37%	$86.43	22,168	11 Feb 2026	Direct	F1
transaction	OTTR	Common Stock	Tax liability	$261,969	-3,031	-14%	$86.43	19,137	11 Feb 2026	Direct	F2, F3
holding	OTTR	Common Stock						488	10 Feb 2026	By ESOP

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Underlying Class	Amount	Exercise Price	Ownership	Footnotes
transaction	OTTR	Restricted Stock Units	Award	$0	+1,100		$0.000000	1,100	10 Feb 2026	Common Stock	1,100		Direct	F4, F5
holding	OTTR	Restricted Stock Units						325	10 Feb 2026	Common Stock	325		Direct	F4, F5
holding	OTTR	Restricted Stock Units						500	10 Feb 2026	Common Stock	500		Direct	F4, F5
holding	OTTR	Restricted Stock Units						900	10 Feb 2026	Common Stock	900		Direct	F4, F5

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	Represents shares received upon the vesting of certain performance criteria in connection with a Performance Share Award (granted in 2023).
F2	These shares were withheld by the Corporation to pay taxes due upon vesting of this award, exempt pursuant to Rule 16b-3(e).
F3	Total direct holdings include shares held jointly with spouse and shares acquired through the Employee Stock Purchase Plan, the Dividend Reinvestment Plan, and shares acquired pursuant to Restricted Stock Awards and Performance Share Awards.
F4	Each restricted stock unit represents a contingent right to receive one share of Otter Tail Corporation stock.
F5	The restricted stock units vest in four equal annual installments beginning the date shown above.